gauss.cpp

Go to the documentation of this file.

// OpenBEM - Copyright (C) 2026 Shashwat Sharma
 
// This file is part of OpenBEM.
 
// OpenBEM is free software: you can redistribute it and/or modify it under the terms of the
// GNU General Public License as published by the Free Software Foundation, either version 3
// of the License, or (at your option) any later version.
 
// You should have received a copy of the GNU General Public License along with OpenBEM.
// If not, see <https://www.gnu.org/licenses/>.
 
 
#include "quadrature/triangle/gauss.hpp"
 
#include <functional>
 
#include "types.hpp"
#include "constants.hpp"
#include "geometry/primitives/triangle.hpp"
 
 
namespace bem
{
 
template <uint8_t dim>
void GaussTriangleQuadrature<dim>::set_order(const uint8_t order)
{
    if (order > TRI_MAX_ORDER)
        throw std::domain_error(
            "GaussTriangleQuadrature::set_order(): order must be less than or equal to "
            + std::to_string(TRI_MAX_ORDER) + "."
            );
 
    base::order_ = order;
    base::points_.resize(dim, rules_[order - 1].num_nodes);
    base::weights_.resize(1, rules_[order - 1].num_nodes);
    base::points_weights_computed_ = false;
    return;
};
 
 
template <uint8_t dim>
void GaussTriangleQuadrature<dim>::compute_points_weights(
    const Triangle<dim>& tri,
    std::function<EigRowVec<Complex> (ConstEigRef<EigMatNX<Float, dim>>)> eval
    )
{
    base::points_.noalias() =
        tri.v().rightCols(2) * ref_points() + tri.v().col(0) * (
            one
            - ref_points().row(0).array()
            - ref_points().row(1).array()
            ).matrix();
    base::weights_.noalias() = tri.area() * ref_weights() * 2;
    base::points_weights_computed_ = true;
    return;
};
 
 
template class GaussTriangleQuadrature<2>;
template class GaussTriangleQuadrature<3>;
 
}